Hitachi EH-150 Series - Page 78

Chapter 6 Communication Mode
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Modbus Master
 Sample program [ Initial setting + Send Query, Receive response ]
(1) Ladder program
[EH-CPU]
R100 = 0
WR100 = H0006 … No. of send data (byte)
WR101 = H0501 … Device No. , Function code
WR102 = H0010 … Starting address of coil
WR103 = 16 … The number of coils
WR7 = H0080 … Query send command
M0 = 1
Query data, command set.
TRNS 9 command start
R100
X3229
For initial setting
TRNS 9 ( WY325 , WR0 , M0 )
WR7 = H0000 … Initial setting command
WR8 = 200 … Command timeout time
WR9 = H000A I/O address of sending data area
WRA = H0100 ( WR100 )
WRB = H000A I/O address of receiving data area
WRC = H0200 ( WR200 )
WRD = H0400 … Size of receiving data area
WR100 = H0006 … No. of send data (byte)
WR101 = H0010 … Communication mode
WR102 = H0000 … Modbus transmission mode
WR103 = 50 … Receiving timeout time
S
DIF1
R7E3
R7E3
M0
R7E3
s parameter
Sending data area
(parameter for initial
setting)
TRNS 9 command
TRNS 9 command
execution